Bouncing part 2 FFF (2009-Oct-13 14:13 EDT)

Find bouncing angle of ball when you know the ball's heading and bumper's heading; 1) by rotating the system; 2) using algebraic linear combination.

Mathematics

North America

by <> (2010-Sep-03 7:42 EDT)
Great exposition. I'm loving this approach, particularly the graphs that pop up to show things, and the way you showed the step by step by clicking buttons. Only improvements I can see is to perhaps make it clearer what you're trying to learn. I was a bit confused when we switched to "how does Etoys do it on the walls" and then "traditional geometry." In other words, just a simple transition sentence or two to make it flow better. Great job!